Baking Pan Size Calculator
When a recipe calls for a different pan than the one you have, the batter has to be scaled. Enter the old pan's length and width and the new pan's, and this gives the scale factor.
- Free
- Works offline after your first visit
- Saves on this device
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- Updated
How it works
The scale factor is the new pan's area divided by the old pan's area. Multiply every ingredient by that number to fill the new pan to about the same depth.
This assumes both pans are the same depth. A deeper pan may need a longer bake, and a shallower pan may bake faster, so check the batter as it cooks.
Worked example
A recipe written for a pan 9 in by 13 in needs every amount multiplied by 0.55 to fill a pan 8 in by 8 in.
Questions
Why does the depth matter?
The area sets how much batter fits in a pan, but depth decides how it bakes. Keeping the depth the same keeps the timing close.
Will the bake time change?
Usually a little. Start checking at the time the old recipe gave, then check for doneness.
Does this work for round pans?
Yes. Enter the diameter as both the length and the width, since area works the same way.
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